JPH0721788U - Warp cutting detector for loom - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent a reduction in the rate of discovery of cutting threads on high-speed looms. [Structure] A plurality of sweeping claws 6 are planted in a comb shape on the outer circumference of a rotating cutting yarn sweeper 4, and a plurality of thread catching bodies 60 are also planted in the same row or close to the sweeping claws 6. Then, with the rotation of the cutting thread sweeping device 4, the cutting thread 2 ′ is given a tensioning action by pulling the thread hooking body 60 in addition to the sweeping action by the sweeping claw 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a warp cutting device for a loom used in, for example, a water jet or air jet type loom, a rapier type or a fly type loom, and the like. More specifically, the present invention relates to a warp cutting detection device for a loom, which is used in a loom for weaving a weft yarn between weft yarns in which a plurality of warp yarns are arranged in a row and sequentially inserting the weft yarn in each weaving operation.

[0002]

[Prior art]

 Conventionally, when a warp is cut during weaving in a loom, a pin dropper method or a phototransistor method has been used as a method of detecting the break and automatically stopping the loom. With the conventional pin dropper system, it was possible to find a cut warp with a discovery rate of almost 100% and to stop the loom instantaneously. However, since the same number of dropper pins as the number of warp yarns are used, a considerable number of pins are used. It requires a lot of time and labor for the preparation work such as the warp threading, and the pins are worn out so much that the replacement and maintenance costs are large.

On the other hand, in the conventional phototransistor system, a phototransistor device is installed in the lower part of the warp string, and when the cut warp hangs downward, the optical path of the photoelectric device is interrupted to detect the warp breakage. With this photoelectric method, there is an advantage that complicated preparation work such as that of the conventional pin dropper method can be omitted, but the detection of warp cutting is likely to be uncertain. There was a flaw. That is, the cut warp does not always hang downward, and often remains attached to the adjacent warp, and in such a case, detection by the photoelectric device becomes impossible or delayed. It was not put to practical use due to its drawbacks such as

[0004]

In view of the above-mentioned drawbacks of the conventional warp cutting detection device, an improved method of this is to provide a needle-like scraping claw planted in a rough comb shape and a single row or A cutting thread sweeper consisting of an operating roller having brushes densely planted in a plurality of rows on the outer peripheral surface is provided close to the warp row, and the operating roller is rotated so that the tip of the sweeping claw is moved to the warp thread. It has come to be used that the cut warp thread that has entered the row and pulled out of the row is hooked on the brush to make it tense, and the tension force is used to stop the loom.

FIG. 8 shows an outline of a main part of a warp cutting detection device for a loom of this type. An operating roller 8 is provided in the vicinity of the warp row 2b of the warp rows 2a and 2b in which a plurality of warp threads are arranged in a row. A plurality of claws 6 are planted in a comb shape. Brushes 7 are further provided in rows on the outer periphery of the operating roller 8. Further, the operation roller 8 is provided with a wire support pin 5, and one end of the wire is supported by the tip end side of the wire support pin 5. This wire is installed in parallel with the operating roller 8, and the end opposite to the wire support pin 5 is directly connected to the sensor. When the actuating roller 8 rotates, the tip side of the scraping claw 6 enters the warp row 2 and if there is a cut warp 2'in the warp row 2, the cut warp 2'is scraped out. The claw 6 scratches out and the scraped cut warp yarn 2'is hooked on the brush 7 to apply tension to the cut warp yarn 2 '. Then, the cut warp yarn 2 ′ comes into contact with the wire supported by the wire support pin 5 to push the wire down to the operating roller 8 side. Then, tension is generated in the wire, a sensor provided on the other end side of the wire is turned on, and it is detected that the warp 2 has been cut, and the loom is suddenly stopped based on the detection output. In the figure, 1 is a reed.

However, in the system configured as described above, the discovery rate of cut warps is only 70 to 80% as compared with the pin dropper system, and moreover, it takes time to discover the loom. It takes about 20 to 30 seconds on average to stop suddenly. As a result, for example, when the number of rotations of the loom is 600 rotations / minute, the average number of defects is 10 to 20 cm.

In order to remedy this drawback, it was considered to make an improvement as shown in FIG. 9, for example. As shown in FIG. 9, a bent hook-shaped thread hooking body is planted in a comb shape on a plurality of operating rollers 8, and a cutting warp thread 2'is hooked and pulled from the thread hooking body, and a tension is applied to the cutting warp thread 2 '. Is configured to give.

According to this structure, the discovery rate of cut warp yarns was improved to 80 to 90%, and the flaw length was shortened to 5 to 15 cm.

However, recently, the speeds of the water jet loom (WJL) and the air jet loom (AJL) in the loom have been improved, and have reached 900 rpm. As a result, the speed at which the upper yarn 2a and the lower yarn 2b of the warp yarns are alternately exchanged is too fast, and the cut warp yarns hardly hang down. In this case, even with the improvement plan shown in FIG. It fell below 30% and became unusable for practical use.

The present invention has been conceived in view of the above circumstances, and an object thereof is to prevent a reduction in the discovery rate of cut warp yarns on a high-speed loom.

[0011]

[Means for Solving the Problems]

 The present invention according to claim 1 is used in a loom in which weft yarns are sequentially inserted between weaving rows in which a plurality of warp threads are arranged in a row for each weaving operation, and weaving is performed. A yarn cutting detection device, wherein a plurality of combing claws are provided and rotated so that the tip side of the scraping claws enters the warp row and scratches the cut warp out of the warp row. A cutting device, and a detection means for detecting the cutting yarn scraped by the cutting yarn scraping device, wherein the cutting yarn scraping device has a bent portion in its outer shape and hooks the cutting warp yarn. A plurality of thread catching bodies to be pulled are planted in the same row as or in the vicinity of the scraping claws, and as the cutting thread scooping device rotates, the scraping action of the scraping claws on the cut warp threads is performed. In addition to the above, it is characterized in that a tension imparting action is provided by pulling the yarn hooking body.

According to a second aspect of the present invention, the tip end side of the bent portion of the thread hooking body according to the first aspect is bent at an angle of 90 ° or more with respect to the above-mentioned raking claw. .

According to a third aspect of the present invention, the yarn hooking body according to the first aspect is made of a flexible material, and when a normal uncut warp yarn is hooked, It is characterized in that the yarn hooking body itself is deformed so that the warp yarn that has been hooked comes off and the warp yarn can be returned to the original warp yarn row.

According to a fourth aspect of the present invention, the yarn hooking body according to the first aspect has a protrusion length of 1. It is characterized in that it is 0 mm or more and 3.0 mm or less, and the interval between adjacent thread hooks is 1.0 mm or more and 3.0 mm or less, and it is used in one to several rows.

[0015]

[Action]

 According to the present invention as set forth in claim 1, when the cutting yarn scraper rotates, the cutting warp yarns are generated when the tip end side of the scraping claw enters the warp yarn row to form the cutting warp yarns. It is scratched out of the line. Then, the scraped cut warp yarns are immediately hooked on the yarn hooking body and pulled so that tension is applied. Then, the tensioned cut warp is detected by the detection means.

According to the present invention as set forth in claim 2, in addition to the operation of the present invention as set forth in claim 1, the bending hook tip side of the thread hooking body bends at an angle of 90 ° or more with respect to the raking claw. Therefore, the cut warp can be more reliably pulled by the cut warp being locked by the bent portion bent at 90 ° or more.

According to the present invention as set forth in claim 3, in addition to the function as set forth in claim 1, the thread hooking body is made of a flexible material, and the normal warp thread not cut is When it is caught on the thread hook body, the thread hook body itself is deformed and the warp thread that has been hooked comes off, and it becomes possible to return the warp thread to the original warp thread row and hook the normal warp thread. The inconvenience of applying tension and cutting or stretching can be prevented.

According to the present invention as set forth in claim 4, in addition to the effect of the device as set forth in claim 1, a large number of relatively small thread hooks are planted in a relatively dense state. Improves the pulling force by hooking the cut warp.

[0019]

[Example of device]

 Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an operation explanatory view for explaining an operation of a loom to which the present invention is applied. As the weaving operation of the loom progresses, the warp row 2 is fed out from a beam (not shown), and the heddle 52 separates the warp row 2 up and down while the warp row is moving. A weft is inserted between the upper and lower warp rows 2a and 2b separated from each other, and after the weft is inserted, the upper heddle and the lower heddle 52 are replaced with each other to insert the inserted warp. Be done. In this state, the weft yarn is inserted between the upper warp yarn row 2a and the lower warp yarn row 2b which have been further exchanged, and further the upper and lower warp yarn rows are exchanged by the function of the heddle 52, and the weft yarn is woven. This weaving operation is repeated to complete the woven fabric.

A cutting yarn scratching device 4 for scraping the cut warp yarns to the outside of the lower warp yarn row 2b is arranged near the lower warp yarn row 2b. In the cutting thread sweeper 4, a wire support pin 5, a sweeping claw 6, a brush 7, and a thread hooking body 60 are planted on a rotary rail 8. When the rotary rail 8 rotates, the wire support pin 5, the raking claw 6, the brush 7, and the thread hooking body 60 rotate integrally, and the tip side of the raking claw 6 enters the lower warp thread row 2b to move downward. If there is a cutting thread in the warp row 2b, the cutting thread 2'is scratched out of the warp row, and the scraped cut warp thread 2'is immediately hooked on the thread hooking body 60 and pulled to cut. Tension is applied to the warp 2 '. The cutting thread 2 ′ to which the tension is applied is wound around the outer circumference of the cutting thread scraper 4. In the figure, 1 is a reed.

FIG. 2 is a schematic perspective view showing the cutting yarn scraper 4 and its peripheral devices. Bearings 11 and 12 are provided at both left and right ends of the cutting thread scraper 4, and the cutting thread scraper 4 is rotatably attached to the loom body by the bearings 11 and 12. It should be noted that one bearing 11 is fixed to the loom main body via a bolt 19, and the bearing 11 can be detached from the loom main body by loosening the bolt 19. The bare ring 11 can be removed from the cutting yarn scraper 4 in a detached state. With the bearing 11 removed, holding members 40a, 40b, in which the raking claw 6 and the thread hooking body 60 are planted from the insertion groove 17 (see FIG. 3) formed in the rotary rail 8, 40c can be removed. There are three types of holding members 40a, 40b, 40c, namely, holding members 40a, 40c located on the left and right of the cutting yarn scraper 4 and a holding member 40b located in the center.

The wire support pin 5 supports one end of a wire 9. The other end of the wire 9 is attached to the sensor 10. Further, the cutting thread sweeper 4 is provided with a pulley 13, which is interlockingly connected with a pulley 14 of a motor 16 by a belt 15. When the motor 16 rotates, the rotational force thereof is the pulley 14, the belt. 15, the cutting thread scratching device 4 is transmitted through the pulley 13 so that the cutting thread scratching device 4 rotates integrally with the sensor 10.

As described above, when there is a cut yarn in the lower warp yarn row 2b, the cut yarn 2'is scraped out of the warp yarn row by the scraping claw 6 and is caught by the thread hooking body 60. The tension is applied to the cutting thread 2 ′, and the tensioned cutting thread 2 ′ is wound around the outer circumference of the cutting thread sweeper 4, and the winding force causes the wire 9 to be wound as shown in FIG. 2. It transforms into a letter shape. Then, the sensor 10 attached to the other end of the wire 9 detects the pulling force due to the bending of the wire 9 into a dogleg shape, and the detection output indicating that the cutting thread 2'is generated is derived.

FIG. 3 is a cross-sectional view of the cutting yarn scraper 4. The cutting thread scraper 4 has a rotary rail 8. On the outer periphery of the rotary rail 8, an insertion groove 17 for inserting and holding the holding members 40a, 40b, 40c of the scraping claw 6 and the thread hooking body 60 is formed. The brush 7 is planted on the rotary rail 8, and the wire support pin 5 is fixedly held.

When the cutting thread scraper 4 configured as described above rotates in the direction of the arrow shown in FIG. 3, the cutting threads 2 ′ in the lower warp thread row 2 b are scraped by the scraping claws 6 and the thread catching body is provided. The cutting thread 2 ′ is hooked by 60, and the cutting thread 2 ′ is pulled by the thread hooking body 60 and bites into the brush 7 in a state where tension is applied. On the other hand, when normal uncut warp threads in the lower warp thread 2b are accidentally hung and hooked on the thread hooking body 60, the thread hooking body 60 is made of a flexible resin (for example, a teguus used as fishing line). The thread catching body 60 is deformed as the cutting thread scraper 4 rotates, and the thread that is hooked comes off and the normal thread becomes the original lower warp thread. It is configured so that it can return to the row 2b.

FIG. 4 is a diagram showing the shapes of the raking claw and the thread hooking body. 4A is a view seen from directly above, FIG. 4B is a view seen from the front, and FIG. 4C is a view seen from the side.

As shown in (c), the holding member 40a is filled with the scraping claw 6, the thread hooking body 60, and the resin 20 having a resistance of 10 ⁸ Ω or less. The scraping claw 6 and the thread hooking body 60 are planted in the same row as shown in FIG. Further, as shown in (b) and (c), the thread hooking body 60 has a hook-like shape in which the tip end side is bent, and the angle θ between the tip end side of the bent portion and the raking claw 6 is 90. It is configured to be at least °.

The scraping claw 6 is made of metal, and the scraping claw 6 is fixed in a state of being in contact with the holding members 40a, 40b, 40c made of a metal material. The static electricity generated by the rubbing is led to the ground through the scraping claw 6, the holding members 40a, 40b, 40c, the bear rings 11, 12, the bolt 19 and the loom body.

FIG. 5 is a circuit diagram showing a control circuit used in the warp cutting detection device. In a normal operation state in which the warp yarn 2 is not cut, the cut yarn is not detected by the sensor 10, so that a low level signal is input from the sensor 10 to the flip-flop 30. In this state, since the flip-flop 30 is in the reset state, the low-level signal is input from the flip-flop 30 to one input terminal of the AND gate 61. As a result, the low level signal is input from the AND gate 61 to the inverter 37, the low level signal is inverted by the inverter 37, and the high level signal is input to the base of the transistor 38. In this state, since the transistor 38 is in the lead-out state, the motor driving signal is input to the motor driver 39 and the motors 46 and 16 are driven. The driving of the motor 46 brings the entire loom into an operating state, and the driving of the motor 16 causes the cutting yarn scraper 4 to rotate.

On the other hand, the low level signal from the AND gate 61 is also input to the base of the transistor 43, the transistor 43 is in a non-conducting state, and the brake driver 47 is in a non-operating state. Further, since the low level signal from the flip-flop 30 is input to the base of the transistor 33 and the transistor 33 is in the non-conducting state, the buzzer 35 and the lamp 34 are in the non-operating state.

A magnetic sensor 62 is connected to the other input terminal of the AND gate 61. The magnetic sensor 62 detects a magnet provided at a predetermined position of the cutting thread scratching device 4, and the cutting thread scratching device 4 rotates to move the thread hooking body 60 to the side opposite to the lower warp thread row 2b. When rotating downward (downward), the magnet comes close to the magnetic sensor 62 and a high level signal is derived from the magnetic sensor 62.

When the cutting yarn 2 ′ is generated on the warp yarn 2 and the cutting yarn 2 ′ is detected by the sensor 10, a high level signal is input from the sensor 10 to the flip-flop 30. Then, the flip-flop 30 is switched to the set state, the high level signal is input to the base of the transistor 33, and the transistor 33 becomes conductive. Then, electric current is supplied to the lamp 34 and the buzzer 35, the lamp 34 lights up, and the alarm sound is emitted from the lamp 35.

The high level signal from the flip-flop 30 is also input to one input terminal of the AND gate 61. Further, when the thread hooking body 60 rotates to the side opposite to the lower warp thread 2b, a high level signal derived from the magnetic sensor 62 is input to the other input terminal of the AND gate 61. Then, a high level signal is output from the AND gate 61, the high level signal is inverted by the inverter 37, and the low level signal is input to the base of the transistor 38. Then, the transistor 38 is brought into a non-conducting state and the motor driving signal is not inputted to the motor driver 39. Then, the motors 46 and 16 stop, the loom becomes inoperative, and the cutting yarn scraper 4 also stops. On the other hand, the high level signal from the AND gate 61 is also input to the base of the transistor 43, the transistor 43 becomes conductive, the signal for operating the brake is input to the brake driver 47, the brake 48 operates, and the loom suddenly moves. Be stopped. The motors 46 and 16 may be brake motors, in which case the brake mechanism is not required.

When the operator manually stops the loom, the operator operates the stop switch 63. Then, the flip-flop 64 is set and the high level signal is input to one input terminal of the AND gate 65. In this state, when the high level signal derived from the magnetic sensor 62 is input to the other input terminal of the AND gate 65 when the thread hooking body 60 is rotated to the side opposite to the lower warp thread 2b, the AND gate 65 is operated. A high level signal is output from 65. The high-level signal is inverted by the inverter 37, the low-level signal is input to the base of the transistor 38, the motors 46 and 16 are stopped to deactivate the loom, and the cutting thread is scraped in the same manner as described above. The output device 4 also stops. The high level signal from the AND gate 65 is also input to the base of the transistor 43, the transistor 43 becomes conductive, and the brake 48 operates to stop the loom as described above. When the operator wants to reactivate the loom, the operator operates the start switch 67 to reset the flip-flop 64, deactivate the brake 48, and rotate the motors 46 and 16. The loom is activated and the cutting thread scraper 4 is also rotated. The cutting thread scraper 4 may be controlled to start and stop by a control system separate from the main body of the loom.

As described above, when the loom is suddenly stopped due to the cutting yarn and when the loom is stopped by the operator's manual operation, the thread hooking body 60 is rotated to the opposite side (lower side) from the lower warp thread 2b. Since the loom is stopped when the loom is stopped and the rotation of the cutting thread sweeper 4 is also stopped, when the cutting thread sweeper 4 is stopped due to the stop of the loom, the thread hooking body 60 is always in the lower warp thread 2b. Is located on the opposite side (lower side). As a result, even when the normal warp is hung down and then restored to its original position when the loom is stopped, the normal warp unexpectedly catches on the yarn hooking body 60 and the normal warp is stretched. There is an advantage that no inconvenience such as cutting is generated.

Further, when the loom is suddenly stopped due to the cutting thread, the alarm lamp 34 lights up and the buzzer 35 emits an alarm sound. The time-related recovery work is performed by the worker. After that, when the operator presses the reset switch 36, a high-level signal is input from the reset switch 36 to the reset input terminal of the flip-flop 30, the flip-flop 30 enters the reset state, and the inverter 37, the transistors 33, 43. A low level signal similar to that described above is input to each of the above, and the loom and the cutting thread scraper 4 are returned to the normal operating state. Although the control by the digital circuit is shown in the present embodiment, a simple power source ON / OFF circuit for directly stopping the loom in accordance with the detection operation of the sensor 10 may be used. It may be something like this.

Next, another embodiment of the present invention will be described. (1) As shown in FIG. 6, the yarn hooking body 60 is configured to have a ratio of one to two scraping claws 6. Then, the thread catching body 60 is planted in a greatly tilted state so that one thread catching body 60 covers the width of two raking claws 6.

(2) As shown in FIG. 7A, the protruding length of the thread catching body 60 is set to 1.0 mm or more and 3.0 mm or less, and the interval between the adjacent thread catching bodies 60 is 1.0 mm or more. It is configured to be 3.0 mm or less. Then, this relatively small thread hook body 60 is planted in one row or a plurality of rows. The thread hooking body 60, which is relatively small, is made of a resin having flexibility and is made of the same material as a commercially available so-called magic tape.

The thread hooking body 60 may have a mushroom shape as shown in FIG. 7B. The mushroom neck portion 80 of the mushroom-shaped thread hooking body 60 corresponds to the bent portion in the present invention. The thread hooking body 60, which is relatively small, may be provided in the same row as the scraping claw 6, but may be provided at the height of the brush surface instead of the brush 7.

(3) As a method of detecting the cutting thread 2 ′, instead of the detection by the wire, the cutting thread 2 ′ is scraped by the scraping claw and pulled by the thread hooking body 60. Alternatively, the cutting thread may be detected by detecting an increase in the rotational load of the cutting thread sweeper 4 when the cutting thread is wound around the cutting thread sweeper 4.

(4) The scraping claw 6 may have a U-shaped loop. As described above, since the thread hooking body 60 is provided in the same row as or in the vicinity of the raking claw 6, the cutting thread detection rate is improved and the loom is suddenly stopped with a high detection rate even in the case of a high-speed loom. Therefore, there is an advantage that the high speed loom can be operated unattended at night.

[0043]

[Effect of device]

 The present invention as set forth in claim 1 is a loom that rotates at a relatively high speed because the cut warp yarn scraped out by the scraping claw is immediately hooked on the yarn hooking body and put in a tensioned state. Even now, we have made it possible to prevent the inconvenience that the discovery rate of cut warp yarns decreases.

In addition to the effect of claim 1, the present invention according to claim 2 cuts because the tip end side of the bent portion of the thread hooking body is bent at an angle of 90 ° or more with respect to the raking claw. The warp can be reliably locked and pulled by the greatly bent portion, and the appearance rate of the cut warp can be further improved.

According to a third aspect of the invention, in addition to the effect of the first aspect of the invention, the yarn hooking body is made of a flexible material, and the normal uncut warp yarn is hooked. In this case, the thread catching body itself deforms and the warp that is hooked comes off, and the warp returns to the original warp row.Therefore, the inconvenience of unexpectedly catching the normal warp and extending or cutting it is prevented as much as possible. it can.

According to the present invention as set forth in claim 4, in addition to the effect of the invention as set forth in claim 1, since the thread catching body is relatively finely and densely planted, a large number of thread catching bodies are provided. By doing so, the cut warp can be reliably hooked and pulled, and a large tension can be applied to the cut warp, and the discovery rate of the cut warp can be further improved.

[Brief description of drawings]

FIG. 1 is an operation explanatory view for explaining an operating state of a loom.

FIG. 2 is a perspective view showing a cutting thread scraping device and its peripheral devices.

FIG. 3 is a cross-sectional view of a cutting thread scraper.

FIG. 4 is a diagram showing the shapes of a raking claw and a thread hooking body.

FIG. 5 is a circuit diagram showing an example of a control circuit used in the present invention.

FIG. 6 is a view showing another embodiment of the present invention.

FIG. 7 is a view showing another embodiment of the present invention.

FIG. 8 is a diagram showing a conventional example.

FIG. 9 is a diagram showing a comparative example.

[Explanation of symbols]

 4 Cutting thread scraper 8 Rotating rail 6 Scrape claw 60 Thread hooking body 9 Wire 10 Sensor 2 Warp thread 2'Cutting thread 7 Brush

Claims (4)

[Scope of utility model registration request] 1. A warp cutting detection device for a loom, which is used in a loom for weaving by inserting weft yarns between weft yarn rows in which a plurality of warp yarns are arranged in a row, for each weaving operation. A plurality of scooping claws are planted in a comb shape, and the tip side of the scooping claws enters the warp row by rotating and a cutting thread scraper for scraping the cut warp out of the warp row. A yarn hooking body for detecting and cutting the cutting yarn scratched by the cutting yarn scratching device, wherein the cutting yarn scratching device has a bent portion in an outer shape and hooks and pulls the cutting warp yarn. A plurality of them are planted in the same row as or close to the raking claw, and in addition to the raking action of the raking claw on the cutting warp as the cutting thread raker rotates. A warp cutting test for a loom, characterized in that the thread hooking body exerts a tension applying action by pulling. Output device. 2. The warp cutting detecting device for a loom according to claim 1, wherein a tip end side of a bent portion of the thread hooking body is bent at an angle of 90 ° or more with respect to the raking claw. 3. The thread hook body is made of a flexible material, and when a normal uncut warp thread is hooked, the thread hook body itself is deformed and hooked. The warp cutting detection device for a loom according to claim 1, wherein the warp is disengaged and the warp can be returned to the original warp row. 4. The thread hooking body has a protrusion length of 1.0 mm.
The warp cutting detection device for the loom according to claim 1, wherein the yarn catching body has an interval of 1.0 mm or more and 3.0 mm or less, and an interval between adjacent thread hooking bodies is 1.0 mm or more and 3.0 mm or less.